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Earth Science Chapter 8 Vocabulary

weathering a mixture of rock particles, minerals, decayed organic materials, water and air
erosion same processes that operate today operated in the past
uniforitarianism the removal of rock particles by wind, water,
mechanical weathering a crumbly dark brown soil that is a mixture of humus, clay, and other minerals.
abrasion grinding away of rock particles carried by water, ice, wind and gravity
ice wedging a farmer plants different crops in a field each year
chemical weathering the process that breaks down rock and other substances at Earth's surface
oxidation Rock is phyically broken into smaller pieces
permeable the tick mass of though roots at the surface of soil
soil means that material is full of tiny, connected air spaces that allow water to seep through it.
Humus formed by a loose layer of leaves that have been shedded.
fertility Iron combines with oxygen to form rust
loam is anything in the envirnoment that humans use
soil horizon dark colored substance that forms as plant and animal remains decay
topsoil soil that is made up of equal parts of clay, sand and silt.
subsoil the measure of how well the soil supports plant growth.
litter a layer of soil that differs in color and texture form the layers above or below it.
Decomposers the process of ice wedging in rocks that deepen and widen cracks.
sod farmers disturb the soil and its plant cover as little as possible
natural resource ruined farmland in western Oklahoma
Dust Bowl farmers plow their fields along curves of a slope
Soil Conservation organisms that break down the remains of dead organisms
contour plowing is the process that breaks down rock through chemical changes
conservation plowing sol that usually consists of clay and other particles.
crop rotation is the management of soil to prevent its destruction

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